Java packages example

Circle.java

package com.example.shapes;

public class Circle implements Shapes {
    @Override
    public String getShape() {
        return "Circle";
    }

    @Override
    public String getColor() {
        return "Red";
    }
}

Hammer.java

package com.example.tools;

public class Hammer implements Tools {
    @Override
    public String getTool() {
        return "Hammer";
    }

    @Override
    public String getSize() {
        return "7";
    }
}

Main.java

import com.example.shapes.Circle;
import com.example.shapes.Shapes;
import com.example.shapes.Square;
import com.example.tools.Hammer;
import com.example.tools.Tools;
import com.example.tools.Wrench;

public class Main {
    public static void main(String args[]) {
        Shapes circle = new Circle();
        Shapes square = new Square();

        Tools hammer = new Hammer();
        Tools wrench = new Wrench();
    }
}

Shapes.java

package com.example.shapes;
public interface Shapes {
    public String getShape();
    public String getColor();
}

Square.java

package com.example.shapes;

public class Square implements Shapes {
    @Override
    public String getShape() {
        return "Square";
    }

    @Override
    public String getColor() {
        return null;
    }
}

Tools.java

package com.example.tools;
public interface Tools {
    public String getTool();
    public String getSize();
}

Wrench.java

package com.example.tools;

public class Wrench implements Tools {
    @Override
    public String getTool() {
        return "Wrench";
    }

    @Override
    public String getSize() {
        return "6";
    }
}